Vintage Rare Cinelli Strada Road Bike 55 cm (CINSCCNRSTG5506)

Description

This is an extremely rare, Columbus SL-tubed, 1960s Cinelli Strada Road Bike,  complete with a fully original build kit!
With its irregular non-sloping fork crown & brazed-on shifter bosses, waterbottle- bosses, BB gear cable guides and rear derailleur cable eye, has it been suggested by experts, whom I have consulted that this may:
at worst, be either be a Model B, with these braze-ons added;
or
at best, with its 100cm wheelbase, be a prototype SC, with these modifications added, by one of the Cinelli master frame builders, whom were rumoured to have been afforded the opportunity/gift to occasionally build themselves a frame, when these evolutionary add-ons may have been "risked" in that manner!
(Your learned thoughts and inputs in this regard are eagerly anticipated please.)
This prized machine was lovingly specified, cleaned, assembled and fully served, by a Cinelli connoisseur former Professional cyclist.
Specifications:
Frame
Serial Number : 2XX
Tubing  Columbus  SL
Seat Tube : 55 cm ctt
Top Tube : 56 cm ctc
BB Width 68 mm
BB Size & Thread : Italian 36 mm 24 TPI
Rear Dropout Spacing: 123 mm
Front Dropout Spacing: 100 mm
Dropouts Campagnolo
Wheelbase: 100 cm
Brake Caliper Bosses: Bolt On Caliper
Front Derailleur: Clamp On
Seat Post Size  26.2 mm
Groupset:
Headset: Campagnolo Nuovo Record
Cranks : Campagnolo Nuovo Record  170 mm
Rings: 54 44
Bars : Cinelli
Giro d Italia 64 42
Handlebar Cover: Black Leather & Red Handstitched
Stem : Cinelli 1A 10 cm
Saddle: Unicanitor
Seat Post: Campagnolo Nuovo Record 2 Bolt 26.4mm machined down to 26.2mm
Seat Bolt : Cinelli 3 Piece Allen Key
Shifters: Campagnolo Nuovo Record
Front Derailleur : Campagnolo Nuovo Record Clamp On
Rear Derailleur : Campagnolo Nuovo Record Pat ‘73
Brakes: Campagnolo Nuovo Record (No Hoods)
Pedals: Campagnolo Nuovo Record
Toe Clips: Christophe Medium
Toe Straps: Alfredo Binda Black
Wheels: Campagnolo Nuovo Record 36/36h
Rims: Fiamme Red Label
Tubulars: Vittoria Rally Competition
Freewheel: Regina 5 Speed: 13-17
Chain : TEC 3/32” x
1/2”