In Seattle, KJR 950's main slogan was "KJR Seattle, Channel 95" during its heyday during the 1960's.
When Seattle station KING 1090 started their Top 40 format some time during the late 1960's (can't remember the year), they called themselves the "Big 11".
As for fudging the frequency, local 80's alternative rock station KJET was on 1590 but their liners always said "16-00, KJET", and 1600 was the frequency shown on their bumper stickers.
There may have been other stations that abbreviated their calls, but I can't remember them offhand. There was a station in Oregon (Seaside, a big resort town on the coast) whose slogan was "KSWB, Radio 93!". They were Top 40 at the time (late 1960's - early 70's). They play oldies now on a different frequency (840).