I was sooo jazzed when I took a new 73 key WK !250 home from the Guitar Center in the mid-90's. I was the very first keyboard I had with full sized keys, and 73 of them! I was renting a piano at the time and making slow "adult beginner" progress. I got further along with the Casio then, although still thought I mostly just wanted an acoustic piano. I lost it then and most of my possessions, in a Hundred Year Flood in 2008. It was on the stand- who ever thought the water would get over four feet INSIDE with three feet to the floor, but there it was. Both the Casio and my Kimball spinet were gone. I hastily got a Casio WK-200 as a replacement, but they had changed some things and I was on the run so I didn't have much time to fiddle with it for awhile. In the meantime, I stood before a wk-1250 like the one I had in a pawn shop a year or so after the flood, but didn't have the money to buy it.
Last month, I saw one on Facebook marketplace- only $40 and an hour away- the middle C and E weren't working and I saw some videos on cleaning under the keys so I took a chance, even though when I got there the A wasn't sounding either and the B was sounding loudly. Anyway- about an hour to clean beneath the keys and they are all back working perfect. Really like especially the #150 sequence and I recorded a song 20 years ago I may still have on another computer. If I can I'll download it.
So here it is- I think it's the first of its kind- it records 5 tracks but only stores one song. It seems to be the same platform later used on the wk-200 and the WK-6600 I have also now, but the sound was improved on most tones quite a bit by the WK-200 and 5 songs are stored. The WK-6600 has tone synth capability too and DL sounds. Anyway- so it's interesting comparing the same sort of Casios from different eras (mid-90's, 2008 and then about 2016 I guess I got the WK-6600.)