Hej på dig !
Shortly: It is Crescent, not Cresent or Crecent.
92320 was king model with Campagnolo and Your's
92319 use the same frame with Shimano parts.
There is short stories from this famous bike:
100 Kronor... 11 euros. You are lucky guy.
Bottom Bracket was french (full dead) 35 x 1 mm, and
Phil Wood is the shortly and expensive answer. (imho)
1970-80 Sven Gustafsson (early) or Lasse Berg (later)
has made Your's frame. - About 1000 frames / year.
Beautifull bicycle with fascinating toe-clips. (edit: toe-clips overlap)
Very beloved bike. - Very.
I own myself 92316 & 92318 (61 c-c) from 1991 with merckx style
century geometry. 92319 & 92320 were after 1985 actually
Merckx, and 92318 and 92316 were cheaper swedish made copy
of them. (even after 1990, and much stronger too... meaningfull,
if You are a really big guy)
Merckx and his designer Ugo DeRosa builds logical ends of
Crescent memorable race-bicycle family. Now days Crescent
race-bicycles are fake too, they are actually Bianchis.
In my opinion only swedish made bicycle are really Crescents.
Vikter= weights and means fork/frame/total.
92316: 0,90/2,70/12,2 (Tange 1,0 mm hi-tensile steel series)
92318: 0,80/2,20/11,0 (Ishiwata 022 double butted series)
92319: 0,70/2,05/9,7 (Columbus Cromor)
92320: 0,70/2,05/9,5 (Columbus SLX)
92319 & 92320 were both under magical 10 kilos.
Did I say, that they were very very beloved bikes ?
Your's 70' frame is full doublebutted Reynolds 531, (0,9-0,6-0,9)
and original swedish made.
It is made for seriously and enjoyable riding.
Please: Keep it gently. And use rustproof for it. (!!)
Hope this helps a little.
Black is beautifull... but if You ask... Crescent from seventies
should be orange. imho. Like Bianchi should always be celeste.
Colours are trademarks to some manufacturers.
Horrible colours early 90 models came from professional team,
which were sponsored from PK Banken.