This is the solid-state substitute for the tonewheel Porta-B that weighed a LOT more, but less than all the other tonewheel models.
If I remember correctly, I THINK it's 1976 manufacture, but Hammond had gotten really hinky in their production records by this time in moving to Japan, so that could be off substantially (by a few years).
It's missing the lid and music rack (this was just bent rod, easy enough to do out of 1/8"). I finally hauled it out and fired it up after about 10 years of sitting on the floor, it needed a thorough cleaning and 2 wires in the pedal board were broken, an easy enough fix. All nasty glitching ceased after the cleaning, but the thing still has much of the GOOD kind of grit you get out of the old Hammonds. All the keys, pedals, tablets (rocker switches), etc. work properly after cleaning. Some of the lettering on the tablets is worn off, I'll try to find the template to print for these.
There are a number of good reviews and forum threads about these beasts- opinions range from "fine if you're not looking for tone-wheel sound and something that won't blow up in use completely unpredictably" to "gigged heavily for years with one, it's a perfectly reasonable tone-wheel simulation when properly adjusted." I remember replacing an IC in this thing (divider chip?) about 15 years ago- people complain about ICs being NLA, but nearly all of them have nearly drop-in substitutes or easy mods of different ones. These were, after all, fairly basic-function chips.
The base is rather awkward to use, due to the weight of this thing- over 100 lbs, I am willing to ship, but had to somewhat guess at shipping cost, since the combined weight with the stand and pedals exceeds 150 lbs, certainly I'll adjust to actual cost- but few who are looking for this would want it shipped rather than picking it up. I notice one in Seattle recently posted