Almost never...

I'm not going for "period correct", just cool & functional.

Starting with the Merlin frame/fork, I added the Selle San Marco Rolls saddle atop a Mavic pin. Also the retro-friction (Simplex?) shifters were on-hand, as were the upwrong bars & stem.

Added so far...
Rear hub (Record hi flange 40 hole).................$60
Rims G40's 27"............................................$180
Paul Love Levers black/silver...........................$90
Campy drop bolt...........................................$32
Campy seat QR.............................................$29
Regina freewheel 14-32................................$125
Regina chain................................................$42
Campy 2nd gen. Rally deraileur.......................$180
Campy SR front drlr.......................................$44
Campy Record calipers...................................$90
Campy Record triple crankset.........................$200
Tires & tubes................................................$50
Grips...........................................................$20
Wires/housing...............................................$20
Spokes & alloy nipples....................................$95

Thats $1,257 added to the $200ish for the frame for about 15 bills total.

Course it'll all come crashing to an end when the wife see's this post!

You are not alone, Cyclotoine!