The following parts are common between the Royal Mistral (RM) and DW Mistral, per the schematics:
Yoke
yoke screw
dust cap
snap ring
filter
body locating dowel pin
body gasket
can clips (for securing the cans together)
plate screws for lever plate
primary lever
secondary lever
adjustment nut screw
adjustment nut
Diaphragm
These parts are common between the RM and the Royal Aquamaster:
Spring (between filter and crown block)
Crown block (depending on part number of RAM/conshelf)
Based upon my sample size of 1, my RAMs, my conshelfs, and several parts schematics these parts are unique to the RM:
Orifice
HP seat
sleeve
HP seat spring
regulator body
seat pin
.
The deflector built into the can is unique to the RM.
View down the intake horn of the regulator.
Close up of intake horn.
The diaphragm that came with the regulator was original, and was a 2 stage design with the tabs bent as we have all observed previously.
The body, levers, and plate all externally look identical to a regular mistral, to include the body gasket. Internally, the body is markedly different.
I didn't take measurements, but the filter, snap ring, and springs all look like the usual USD stuff. The part numbers match too.
The crown block looks identical to a conshelf visually, but I have not used a micrometer. The part number matches some RAM/conshelf regulators. The crown block does NOT have a backup ring.
Another shot of the crown block, HP seat, and spring.
The spring between the seat and crown.
A closeup of the HP seat, which is solid chrome plated brass.
A shot of the balance chamber of the HP seat.
The cone of the HP seat.
The pin, which looks similar to a mistral but larger and longer. It is also a different part number.
This sleeve sits around the orifice. The orifice has an O-ring around it, like a calypso. The sleeve sits in the main body, and the orifice sits in the sleeve. The o-ring is a standard -12 o-ring.
The reverse of the orifice. It appears to be blackened brass, without any nylon or teflon.
Closeup of the seat mating surface of the orifice.
The HP seat, with its orifice oriented to the side that mates with the seat.
So let me throw a few things out there to manage expectations. I am not a mechanical engineer. Please don't expect me to know mechanical engineer things. I don't expect you to be able to write code in C#, so don't expect me to understand graduate level fluid dynamics. I would like to keep the discussion simple, and in common language. I get that these are just photos. If you want measurements or anything, then just let me know what you would like in normal language that I can understand and I will happily provide anything for which you ask. I own a micrometer, scuba repair tools, a magnahelic, and a standard set of mechanic's tools. In the next few days, I am going to tinker with this rarity and try to get it to work. I am willing to provide parts on loan to people for measurements or what have you if I know you. If not, that's fine too. I'll just see if I can get it running myself if none of this pans out. Thursday night is trivia night at the bar, so please forgive any typos
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The impossible missions are the only ones which succeed. -JYC
