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g8tr72 · 13 March 2018, 03:23 PM

This is my first post, so I hope I comply!

I just came across an on-line offering of a "vintage" Air-King 5500 at a reasonable price, but the indicated year of production compared to what I can make out on the case S/N seem in conflict. Seller indicates about '67 or '68. Serial No. appears 947660 with a strange symbol at the end. Would appreciate any thoughts or comments!

freefly · 13 March 2018, 04:17 PM

I think that "strange symbol" is the number "8".

Can't completely make out the first digit of the SN on this monitor, but looks like either a 3, 8, or 9 mil SN. The oldest variation (3 mil) would put it in the early `70s.
If it is in fact a 9mil, then it would be late `80's, just prior to the switch over to the Alpha-numeric SNs.

g8tr72 · 14 March 2018, 12:22 AM

That would do it - need a closer look! Thanks.

13 March 2018, 04:17 PM	#2
freefly "TRF" Member Join Date: Jul 2010 Real Name: Eric Location: AZ Watch: 4&5-digit Sub/GMTs Posts: 1,974	I think that "strange symbol" is the number "8". Can't completely make out the first digit of the SN on this monitor, but looks like either a 3, 8, or 9 mil SN. The oldest variation (3 mil) would put it in the early `70s. If it is in fact a 9mil, then it would be late `80's, just prior to the switch over to the Alpha-numeric SNs.

14 March 2018, 12:22 AM	#3
g8tr72 "TRF" Member Join Date: Mar 2018 Real Name: Stewart Location: Orlando, Florida Posts: 8	That would do it - need a closer look! Thanks.

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