Mixed Shooter, is it possible to date DWM toggle assembly and Mauser frame?

[Quentin]

I have a Frankenstein Luger with major assemblies cannibalized from 3 Military P08s. The craftsman who assembled it was a much better doctor than Victor Frankenstein though as this is a nice shooter, reliable and accurate. I've put about 3,000 rounds through it over the years with very few stoppages. Even when the toggle/receiver pin sheared in half the pistol continued to fire. (I didn't discover it until cleaning the Luger afterward and of course replaced the pin.)

The barrel and receiver are mates from a 1938 S/42 style Mauser as they both have the serial number 213, however on the receiver 213 is struck out and 4162 is struck above. 1938 of course appears on top of the receiver. They must be salt blued as the receiver is a plum color while the barrel is darker blue.

The frame is from another Mauser I believe and is numbered 4547i (not overstruck). I've been told it may be from 1936 judging from that number but don't know if a frame can be dated by its SN.

The toggle assembly is DWM with matching numbers of 54. I've been told it may be from 1925 but don't know if it can be dated that accurately.

The small parts are all numbered differently but everything works well together and wear patterns (especially the side plate and frame) indicate this piece has been a single unit for a long time. I suspect it was assembled from damaged pistols and spare parts, reworked and reissued in the latter part of WWII, certainly after 1938.

Maybe the overstruck SN was a way to track the pistol for inventory and the damaged guns were written off as lost or destroyed. (Don't know how much accurate inventory mattered at that time, though.) I assume the overstruck 4162 on the receiver would be considered the SN but it's not likely to be unique since there may have been dozens of 1938s with 4126 and a small letter added.

Is it possible to determine the year of a DWM toggle assembly and a Mauser frame? I'm happy with this Luger, not planning to sell it, just curious about its parts.

Thanks for reading and I'll try to get some pictures posted if anyone is interested.