I would also agree the joint looks like a Viking Super Joint.
I just checked some old catalogs I have, the cue is a Model X300 and it was made in 1974, the X-series had 26 cues in the series, the X300 is the highest end cue from the series. The original retail price on the cue was $300, in the Blue Book of Cues in 98% condition - $1550, 90% - $1050 and 70% - $700, the cue in your photo's is the third cue from the top on page 833.
So it looks like a good find eventhough it isn't a Coster!