I found these Alta brand girder forks at a parts meet a few years ago. They were too unusual and cheap to resist. They have suffered a bit from storage but are new old stock. It seems that perhaps the chroming wa of very cheap quality in the first place. The forks seem to be Italian made and are with one inch steerer and English threads.
The best guess would be that they were marketed at a time when cyclemotor attachments were popular. They certainly have the look of an early fifties component about them. They are made to fit a frame size of around 23 inches, obviously dependent on steerer tube length. There is no anchor for a drum brake but there is a bridge for a caliper.
Hopefully some day I'll find the right frame to put them on. I did recently come across a BSA Golden Vase that looked like it would fit the bill but when offered up the steerer on the forks was too long.
|Alta cyclemotor spring forks detail.|
|Alta cyclemotor girder forks.|