Lol- I forgot to tell google to do the conversion in Troy ounces ;-) Here's the updated calculation according to GoggleFu:Are you telling us that number in troy pounds or avoirdupois pounds?
1.625 troy pounds would be 19.5 troy oz.
1.625 avoir. pounds would be 26 avoir. oz.
I would expect that you bought in troy pounds, as that is the unit of measurement for PMs...