I realize this is a CJ 5 forum, but I couldn't help noticing all the '87' owners' posts, so I wanted to quickly help answer some questions, then leave it to the good CJ5 owners. ;-). I have included a rare doc. acquired courtesy of my friend in France who is generally acknowledge to be the leading expert of Kaiser era, particularly Gladiator, Wagon and Jeepster. This doc breaks down the production dates for any given month for the '80' series. Left col. indicates the month of the year. Consider there are usually 4 weeks to a month...take the start of month to month for sequential numbers and you can get a reasonably accurate build time (week) within a given month using your own 'sequential' number on the right side of your VIN plate (last 5 digits).
I noticed there is some confusion on the nomenclature of the '87' series. They are 'Jeepster', 'Jeepster Commando', and 'Jeep Commando'. The 'Jeepster' denotes ONLY the 8701 series convertible. The 'Jeepster Commando' denotes the 8702 (austere convertible) and 8705 series (3 body types), while the 'Jeep Commando' denotes the introduction of the AMC era starting with the '72 MY and finished in '73 (last of the Commandos). VIN plates for the Kaiser era were on an aluminum plate affixed to the left firewall and later, added info (month/year of build) was available on the yellow and black decal on the left dash or 'A' pillar area. (caution - do not try to remove this sticker as it is dual layer and will leave behind the "VOID' of the first layer). To answer another couple of inquiries I saw, the 'serial' number matching the last 5 digits on the VIN plate should also be visible on the right side top of the frame rail in 1 or both locations behind the front shock mount our near the rear beyond the axle. Hope this wasn't too verbose. I would highly recommend the '87' owners on here to seek out the very active Jeepster/Commando FB pages also...there are also used parts FB pages devoted also. A number of retailers in USA cater exclusively to the '87' folks with almost every thing you would need, including reman. V6 engines, sheet metal, electrical etc. Further questions, you can PM me is that is available on this site. Cheers.