Jeff,
Thanks for the help. I had two other full calendars with Valjoux 72C's...Both were Wakmann...that I parted with this past week. Both had the Valjoux logo and 72C marked under the balance wheel, so I thought this Heuer might have been an earlier vintage, or perhaps not marked Valjoux for some licensing reason. At any rate it's a really fine movement that even survived being wound VERY tight by an ebay "buyer". He returned it, complaining that the "month" didn't advance when tthe date advanced from "31" to "1". Glad he returned it...wish I had one of the Wakmann's back as well. Is the "C-5809-4" on the caseback the model number?

Thanks again...