Well fuzzy, don't know. Hawes imported several Marshall series that were chambered for the .22 rim fire. I believe the Deputy Marshall had a blue finish. Do you have a .22 Magnum cylinder or plan to get one. It was possible to buy a set with a convertible cylinder. If you plan on getting one be advised that they are not always a drop in fit. The ones sold in the set, were fitted at the factory, if you pick a cylinder up off Flea bay, it may or may not be a drop in fit, if the timing is off then you will have to pay a gunsmith to fit for you. They are good guns that at the time sold for a good price. You didn't ask for advise but what the hey, It it were I, I would just enjoy shooting it in 22 LR and not worry about the 22 mag part. I have several guns in .22 magnum and almost never shoot them. What ever you do, Good Luck and shoot safe.
I just reread your post and noticed you typed Schmidt, Most of Hawes single action Marshall's series ( I through all ) were made by Sauer and Son,, is your revolver a single action ( cowboy gun, I hate that expression but it get the image across ) or a more modern type revolver with a swing out cylinder???