Vintage metal waist buckle, info wanted

[CT-Rich]

This is the buckle on my twin 50s.

 

[tursiops]

A hook for a crotch strap if i recall correctly.

That's what mine was for. I think it was on a Parkway buckle.

 

[Luis H]

This is the buckle on my twin 50s.

I assume those are Dräger?
I have a set of those with that same harness and buckles. Well, mine are decommission for right now, but I am still saving the bands and harness for a future project.

 

[CT-Rich]

I assume those are Drager?
I have a set of those with that same harness and buckles. Well, mine are decommission for right now, but I am still saving the bands and harness for a future project.

It is from a Drager. The harness is too small for me and getting them through hydro would be problemati, so it display only.

 

[Augustus]

here is a scuba pro from 1978 more or less. Not sure if it ever went into production. Was a gift from scuba pro back in the day

 

[Zef]

I have a couple of depth compensating buckles in my spare parts bin. I don't have actual photos at the moment as I am on extended travel, but they are an older version of this picture swiped from google images:

 

[Zef]

I also have one of these SP buckles (again, sorry not my picture):

-Z

 

[Jcp2]

I have a couple of depth compensating buckles in my spare parts bin. I don't have actual photos at the moment as I am on extended travel, but they are an older version of this picture swiped from google images:
View attachment 696235

How does the depth compensation work?

 

[Zef]

How does the depth compensation work?

The buckle is manufactured with edges at the top and bottom (encircled in red) hollow. The part of the buckle with the area encircled in blue slides in the hollow edges and is pulled by springs to the shortened position...when putting on the weight belt the springs in the hollow edges are stretched so the buckle effectively shortens and compensates for compression of a neoprene wetsuit at depth:

-Z

 

[Still Kicking]

I also have one of these SP buckles (again, sorry not my picture):

View attachment 696236

-Z

That HAS to be a bottle opener!