Almost perfectly
A - this is the guy who made the final adjustments and corrections
4. - most likely 54 cm (could be 64 cm - the dot sometimes indicated a non-standard frame size)
E070 - according to the latest findings, the frame may have been built in September/October 1980.
Before the E series was built:
- series without serial markings: number unknown, at least a few dozen units
- a series "without a letter": the highest known number was 1048
- V series: early designs - highest known number is 515
It is unknown how many of these frames were built during the "training at De Rosa" (probably the V series and perhaps the series without serial markings), and it is not known whether the numerical continuity of the markings was maintained.