Need help identifying two regulators

[James Sizemore]

I believe the first one is a Mk5 first gen with the 2 low pressure ports (please confirm me), but the second one is the one I really have questions on with 5 low pressure ports. Also, I have heard the both have possible brass turret bolts and should be replaced with stainless steel bolts. I am looking to rebuild both of these.

 

[Luis H]

Yes, they are both Mk-5.
The first one could actually have a snap ring instead of a turret bolt it is a very early one, but it probably has the brass bolt.
The second one only has one HP port, but it does have the latest higher pressure yoke, so it is hard to tell if it was upgraded with the SS swivel bolt.
You can get parts and the SS swivel bolt from VintageDoubleHose.com

 

[James Sizemore]

It does have a stainless swivel bolt on the newer yoke reg. upon closer inspection it is magnetic, and when scratched, no brass is shown unlike the one from the 2 port reg. I actually have a cart with VDH being put together. He helped me out alot with the first reg i rebuilt.
Thank you for confirming.

 

[halocline]

The second one certainly had the yoke and LP turret replaced from a later model. I don't think there was ever a stock combination of 1 HP port and 5 LP ports, and I don't think I've ever seen a 5 LP turret on a body without the small "SPEC" ambient chamber holes. Your photos look like they could be of the same reg, with and without the later yoke and turret.

I wouldn't be too concerned about the brass turret bolt in the older reg, unless it's damaged (you can look at it with a jeweler's loupe). Then again, it's always a good idea to support VDH, and it might give you some peace of mind.