Almost every state in the country has someplace that can do it if you take the time to search beyond antique automobiles.
Silvering and Re-silvering is your search for platers . Re-silvering mirrors and hardware,etc
Often it will be will be 2/3/times the price of an aluminum vaporized sealed modern reflective material that needs no attention verses the silver you should polish every season to gain the best re-flectiveness.
Even in the 20s and 30s to the ,40s it was expected to have your reflectors replated or replaced as needed(every few years),if you did your proper maintenance and polished out the silver.
Unless you plan not to use your car regularly,at night often,and are an extreme purest..go for silver if you can't sleep.
But the god of your choice will not judge you, I will not or any other mortal judge you for not resilvering for the ultimate authenic-ness.
I have never seen or heard an A.Hole ever in 50 years questions ones authentic reflective material on headlamps.
Your time,money,and thoughts will be better spent on other details .
If you only knew how many high end, high priced show cars had shxtty chrome(the worst and cheapest reflective material)reflectors,you'd barf.
Let your ego of perfection take a back seat here and compromise for a better ,longer lasting ,more economical material.
Stated with love and experience .
D.
PS
I await another lame banning for "language and demeanor".
.