Alternatives to Prontor timer

[Michael Kadillak]

My mistake Bob. It was so damn well made that I just assumed that it was Linhof.

[Andreas Schmidt]

Bob, any idea of what the difference is between the new Prontor (black) and the old one (grey, probably made in the 60s)? Are they the same inside or is there some major difference?

[Bob Salomon]

Basically the same other then the shape of the housing.

[Reinhold Schulte]

Hi! - I managed to get one of the old Prontors (it cost just 25 Euros - about the same in USD). The new model and the old model have a button, which is labeled "T". Does anybody know, what it is for. Thanks for your help! (Please, be so kind to send an answer off-list, as I'm not a regular reader.)