AJ Morse & Son

01/22/2026

Come with us as we continue to test the next iteration of our 5.56 silencer on its path to being commercially viable. Today, we are doing a 270 round rapid ...

12/22/2025

From the team at DESCO/A J Morse & Son, DESCO Machining, and DESCO Firearm Solutions we want to wish everyone Happy Holidays, Merry Christmas, and a safe happy and prosperous 2026.

12/15/2025

Just posted on the DESCO website.

A J Morse & Son Three Light Commercial Helmet Serial Number 6904 is the fifth AJMS helmet built by DESCO Corporation. When DESCO purchased the assets of Morse Diving we knew going in we would be making the Mark V helmet. Ric and Christian wanted to keep the Morse line and legacy going so we needed additonal helmet models to make. The original Andrew Morse Helmet was a three light with his distinctive breastplate shape. In the late 1880s Morse began making a smaller volume bonnet shell of spun Copper instead of the two piece "castellated" type. They also began stamping the company name into the breastplate and assigning serial numbers. Leon Lyons coined a name for the first generation bonnet, calling it a high dome. The new bonnet shell was called streamlined in the Morse documentation so we continue with than name for them. Much of the patterns and tooloing was lost over the years and much had to be reverse engineered. Lee Selisky loaned us helmets from his collection so we could copy parts and make new patterns. 6904 is a product of that effort.

Helmet 6904 is the most basic of AJMS commercial helmets. It has the hand tinned finish which is very popular due the pewter like appearance which is offset by the high polished Brass castings. 6900 and 6901 were the first AJMS MKE Mark V helmets made. 6902 was a polished neck feed three light helmet. 6903 was a polished three light standard commercial with 6904 being a Tin plated version of the same helmet. All these helmets were made in 2017. 6902, 6903, and 6904 spent time on DESCO's commercial diver jake rig. As the helmets were sold the next helmet in line went on the jake. BTW, the jake is named Lee after Lee Selisky. 6904 has been on the jake the longest (2021). He was on display at Discovery World in Milwaukee for 18 months in their aquarium space. The helmet has been cleaned and serviced and is being sold in diveable condition. The price for a new helmet is $7076.25. We are discounting this helmet to $6500.00. It is currently the only helmet we have in stock. The stand in the photos is not included but can be purchased separately.

12/08/2025

10/02/2025

Another bit of AJMS history to add to the files. The Griffin Museum of Science & Industry has in their collection Morse Shallow Water Diving Helmet. It is an early one with the smaller faceplate. I'm going to reach out to them and see if it has a serial number.

Made by the Andrew J. Morse and Son Company, this sixty-two-pound diving helmet was intended for depths of less than forty feet. The company was founded in 1837 in Boston, Massachusetts, as a marine brassware-making company before making diving helmets and suits.

08/29/2025

Discover the stories of MK V divers in our new exhibit, “Behind the Faceplate,” now open! Introduced in 1916, the 200-pound MK V diving rig was the Navy’s standard deep sea diving system until the early 1980s. Generations of Navy divers shared the experience of diving the MK V, tackling the challenges of their eras with expertise and ingenuity.

“Behind the Faceplate” looks inside the iconic copper helmet to tell stories of MK V divers across the decades. Explore their remarkable feats as innovators, salvage experts, and leaders through historic artifacts, personal stories, and hands-on interactives.

08/29/2025

We wonder what Andrew Morse would have thought about an early 20th century helmet and air pump made by his company diving in the 21st century to celebrate the centennial of an event that changed the diving world.

08/22/2025

I had a reminder today to do my due diligence when working on a project. On Saturday LMCDO did demnostration dives at Door County Maritime Museum in Sturgeon Bay. We were commemorating the 100th anniversary of the first mixed gas dives. We tried to use as much period correct gear as we could. We had AJMS four light commercial helmet 1769 which was made in 1911. We also has AJMS #3 air pump S/N 866 made in 1904. The pump got a complete overhaul (not a restoration) and she worked admirably. For our purpose she made plenty of air. One if the items I wanted to replace was the information card in the pump lid. I had the text and graphics from photos of a few cards. DESCO has a large format color laser printer that will print to 11" x 17". I don't know what the correct dimensions are supposed to be but I figured close enough. This week while putting things away I noticed a discrepancy on the card. It said a two cylinder pump. I have clear recollection of overhauling three cylinders so what gives. I went to the 1910 catalog and it shows a #3 pump with two cylinders. I began to doubt the identification tag on the pump but it looks like it has been there since day one. Since the pump is 1904 and I have a photocopy of the 1904 catalog I checked it. In 1904 the #3 air pump had three cylinders. Another thing was in 1904 Morse was on Congress street. In 1910 they were on High street. I pulled the old card out of the pump and am making a new card to replace it.

The moral of the story: Do the homework and you will only have to do the job once.

08/05/2025

Welcome home to the Kissel ladder truck. AJMS having been a manufacturer of firefighting equipment we wholly heartedly support preserving the history of this noble profession.

06/06/2025

Today we started teardown of AJMS #3 air pump 866. The thing about working on these old pumps is there isn't any repair manuals for them. You learn by doing. #866 was built in 1904 and she was due for an overhaul. The objective is to get her into working condition. The bigger plan is to use this pump at Sturgeon Bay in August. Time is passing fast and this is by far the most ambitious project connected with the SS Lakeland commemoration dives. If we are successful you can come to Door County Maritime Museum on Saturday August 16th and see #866 at work.

03/10/2025

Here is a link to the History of Diving Museum Facebook post of Jon Hazelbaker diving his restored 1916 A J Morse & Son Mark V helmet. I talked with Jon about all the air leaking from the rig. He told me the dress is brand new and on the next dive it had settled down and didn't leak. If you look close at the back of the helmet you will notice the air elbow on the left and comm elbow on the right. they both point downward like you see in the 1916 US Navy Diving Manual photo of 2178. You hardly ever see 1917 Mark V helmets but plenty of 1918 helmets. We had five in the shop atone time once. Two Morse and three Schrader. All the 1918 helmets had the conventional configuration.

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