At the end of the "2nd wave of Ukulele popularity", (around the first half of the 1970's) the big Chicago makers had all gone, most of the Japanese makers had gone, there were very few Hawaiian makers and even Martin, whose fortunes had been made in the 1st wave of popularity gave up making Ukulele, So you see very few Ukuleles made in the 1980's or 90s. Most of the ones you do see were made in Mainland China, (which was still staunchly communist at this time), and had come fairly late to jumping on the bandwagon of the 2nd wave. Exact dates are hard to find, in fact most information beyond what it says on the label is hard to find, but mass production of Ukuleles started in the Shanghai region around the 1960's and continued through until the 1990's with some very budget brands. I have never seen anything that wasn't a Soprano though there was some variation around that scale length and the main brands appear to have come from different factories. As these were the only cheaply produced Ukuleles of the time they were widely exported, even to Hawaii, but this production had ceased before the 3rd wave boom brought a lot of Ukulele manufacture 1200km south in Guangzhou.

Kapok

This was the brand name used by the Kwong Jong Musical Factory on Canton according to the sound hole label. I have also seen other ukuleles with Local State Zing Fu Musical Instrument Factory of Canton but otherwise unbranded, in the sound hole as well. The ukuleles I have seen don't look similar but given the politics of the time it seems unlikely the two factories weren't connected somehow?