I bought an old Centurion roadbike off Craigslist a year ago for $20 and have used it as a commuter bike. It is a sorry sight to behold, though perfectly functional. I have done some amateur attempts at mods and customization and have made it very nice to ride. However, I am curious about the model and would appreciate any information you can supply.

Here are the features of the bike:
Lugged steel frame - no decals or stickers - seems to have been painted over at least once
Chromed fork and stays
Forged dropouts with eyelets
Vertical Centurion headbadge with red lettering
Serial number: MF00201
27" 36 spoke Araya alloy wheels
Suntour ratcheting friction shifters working on a 5sp Suntour cluster
Shifters mounted on clamp-ons on downtube - no braze-ons for shifters or water bottle holders.
Huret Jubilee (?) rear derailleur
SR Sakae 118BCD double chainrings
Diacompe drilled non-aero brake levers
Weinmann centerpull brakes
SR quill stem
Engraving on handlebar with "Sakae Custom" inside a wreath on one side of stem and on the other side, a bicycle with "Centurion" engraved under it

I have since made several changes to it simply because it was zero risk. I have spread the rear dropouts to 130mm and put in a Shimano 8 speed cassette, freehub and rear derailleur. I have replaced the downtube shifters with Shimano bar end 8 speed indexed shifters. I have also put a triple up front. I am now very happy with the indexed bar-ends. Yes, the dropouts are probably not aligned correctly. My rear wheel is not perfectly true because I replaced the freewheel hub with a Shimano freehub, but I am not too worried about it.

The main reason I am curious about it is that it is reasonably light. I have read reports of some Schwinns being 40+ lbs. Though this bike is probably from the 70s, it weighs in the range of 25-27lbs. I don't have an accurate scale and have not weighed it without the rear rack. I am hoping that I will have an excuse to maybe repaint it one day (by myself of course) if it is not a bottom of the barrel bike.