: Hi, looks good to me and in very good mint condition.
: Any backcase marks picture available ?
: Movement must hack if crown is pulled > second hand on left
: subdial must stop.
: Check the flyback function > reset running chronograph by
: pushing the button at four which then must start timing again.
: Good luck !
: Cheers
: Arno
: www.heuerchronographs.com

Thank you people!
It seems that I'll pull the trigger; I've been looking for a Heuer Bund for quite some time now.

@Arno: Unfortunately I don't have any case back pictures; in fact, I haven't seen the watch in the flesh.
The seller told me that the inscription on the case back reads "BUNDESWEHR 6645-12-146-3774".