philmh: makes sense; though yr hmbl srppnt. wouldn't've thought picture discs would've been sold to wholesalers and retailers on the same terms as "nicely priced" back catalogue: so it looks likely either the nice price double lps didn't have a dedicated cat# block (at least, not by then) - or possibly that "nice price" had diminished from aught coherent to simply knocking the wholesale price and the rrp down to the mid-price point on cbs' sales & stock control computer (system), and slapping a "nice price" label on the lp cover/shrink-wrapping, to shift remaining vinyl (& cassette) stocks as soon as full-price sales - and reordering - had declined past a certain level.
- record corpses never did make it easy for "outsiders" to discern logic in their doings, did they?
The new international CBS numbering seems to have started at 450000 in about 1986, and had got up to 450394 with Santana's FREEDOM album in 1987 (linked below), but I doubt that they could have used up 9000+ numbers between then and 1988 to get into the 460000's. Also, the Bros. album linked below is 460629, so I suspect that there was a wholesale and/or retail price change that prompted a jump from the last 450xxx number to the 460000's.
(i've not yet seen anything like enough nice price double lps to guess at their cbs cat# number block.. - or whether they even had a cat# number block reserved for them at all.)