Help Identifying Timeframe Of Gibbons Ad For Farley Sheets

I collect all things Farley and picked this up last week. I checked Sloat's "Farlies Follies" and he refers to George Lee, on page 75, as having seen Gibbons selling these sheets in 1957 or 1958 at a New York ASDA exhibition. The set was later sold by Siegel in 1976.

Does anyone know which year this advertisement is from and which ASDA show the sheets were displayed?

Thanks in advance for your help and feedback.
Rick


*** Moved by Staff to a more appropriate forum. ***

Check with the American Philatelic Research Library to see if they have the 1957 or 1958 ASDA NY Show Program. That should give a list of dealers and table locations.

Edit: It was held in November.