Last week I won an Ebay auction for an Heuer "Bund". I expected to be receiving a "normal" Bund, but the 'versorgungsnummer' seems to indicate that it is an SR version. After closer examination the model number 1551 SGSZ confirms that. The dial does not have the "Sternzeit reguliert" text, but obviously the dial could have been changed during a later service, at least that's what Konrad Kirim writes.

Now on the forum I'm usually active there is some doubt about the originality of the 'versorgungsnummer'. Please have a look, and let me know what you think. Is there a visual difference between the regular movement and that of the SR (different cal.nr. or other visual signs) or is it just the regulation that is different?

Thanks, Ron.