Yale small PTPK padlock 'Made for MARMON'

[candado3]

I stopped at shop that sells old salvaged hardware and was surprised that they had some old padlocks. I bought a few and this one was amongst them. It is a small brass Yale PYPK padlock with an iron or steel shackle. It has a logo on the reverse that states that it was “MADE FOR MARMON”, which is an old automobile company that was in business from 1901 to 1933 in Syracuse NY. Needless to say I was quite thrilled to find this lock. On further investigation it was classed as a spare tire lock.
I have shimmed it open and plan to disassemble it to make a new key for it as there was no key with the lock.
The shackle is quite corroded and I was thinking of exchanging it with a nicer shackle from another small Yale that I own, (I have a number of them). It is the same shape and size and you can make out the writing stamped on both sides of the shackle. But then something tells me that I should leave it as is as that is part of the history of the lock. What do you think?