I looked closely at the display and can see unused annunciators for frequency, us, period, etc. So the display is the same as used in at least one of their frequency counters. It has 12 alphanumeric digits.

I am 99% sure you are correct, it is the same display as the 53131/2A counter. Sadly although in the past I have found and been able to order raw similar displays for product such as the 3458A, after a prolonged search I was never able to find a part number or order the 58503/53132 displays. Often Agilent Keysight kweeps these part numbers in house and does not provide any help with part numbers, but if you know the number you can order it. Anyone have any insight to the part number? Cheers; Thomas Knox ________________________________ From: time-nuts <time-nuts-bounces@febo.com> on behalf of Mark Sims <holrum@hotmail.com> Sent: Tuesday, May 9, 2017 5:25 PM To: time-nuts@febo.com Subject: [time-nuts] Looking for a HP-58503 display I looked closely at the display and can see unused annunciators for frequency, us, period, etc. So the display is the same as used in at least one of their frequency counters. It has 12 alphanumeric digits. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts time-nuts Info Page - American Febo Enterprises<https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts> www.febo.com time-nuts is a low volume, high SNR list for the discussion of precise time and frequency measurement and related topics. To see the collection of prior postings to ... and follow the instructions there.