John,

Think I can help you out with dating those White Horse bottles a bit....

Both of you bottles have the designation "his Magesty the King"...so these are pre-1953.
Also I have seen other White Horse bottles with the "AU" serial number series, and they have all been 1949-1950.

Interested in selling ...I'm in the market for a few bottles like this!

Cheers,
Walter C Hurst
wchurst(@)hotmail(.)com