Would I devalue the car having new calipers or

why put new and improved brakes on your car if you want to keep it original
?

I don't happen to know for certain, but I suspect there are date codes
on the caliper castings. So, if you are really concerned about
maintaining originality, have your old calipers rebuilt. I think most
rebuilders will do that, but at a higher price of say, $20 per caliper,
for the inconvenience of shepherding your castings through the process.

I doubt it would affect resale value today, but who knows, it may in
another 20 years. Not affecting value "today" is how so many older
Vettes became non-numbers matching, piece by piece.

==========================
Go out and buy 4 new Calibers ...BUT keep your original ones and pay
the core charge...  Personally I would NOT expect that a 25 year old
car would have the original calibers (or roters)...and would not
really care BUT if you have the originals that's all that matters ..if
a buyer values them.....

As far as which type to buy...O-ring etc... Your choice..
the original design work just fine... IF YOU DRIVE THE CAR....

I do not drive mine enough so

I use the o-ring type on all 3 of my Sharks and on my Midyear (a 64
which I converted the front to disc brakes)...screw originally when
its my "BUTT" behind the wheel....

To be honest I still have one caliber leaking on one of the cars every
spring...its no big deal... Pressure bleeding only takes a few minutes
and I'm good to go all summer...

Bob G.
64 72 Rag tops
76 79 & 95 Coupes  

Try these links for information on brake casting numbers and dates.

http://www.ncrs.org/forum/archive8.cgi?review=35646

http://www.ncrs.org/forum/archive7.cgi?review=21613

http://www.ncrs.org/forum/archive14.cgi?review=99168

Some brake places will rebuild and return your calipers.  Vette Brakes in
St. Pete is one.  Always ask first, don't assume they will, as most are
simply picked off a shelf and shipped.