We see the Commander in the Bulova model price lists as early as Fall 1961. What I can't tell from the lists is if the Commander is 30 jewels. I don't remember if there was another Commander in the vintage ads from this period with other than 30 jewels.
Here's snippet from the Fall 1961 list.
The Bulova 30 also appear in this 1961 list, in the section breaking models out by price. We see the gold color for the case of the Commander "JW" is yellow. The Bulova unique ID numbers changed sometime between Fall 1958 and Fall 1961. We don't have any other lists during this period. Below far left is the "old bulova ID number", and on the far right is the "new Bulova ID number". This change in ID numbers- from old system to new- make crossreferrencing challanging, but not impossible. For those models not listed with new and old ID system numbers, we can use the advertised Model Name - the middle column below- along with price and other attributes given in various sections of the lists.
By Spring 1964, we see thes Commanders in the list (below). Several "Bulova 30" are also in the list at this time too (not pictured, but you can check the lists yourselves). Still no confirmation on jewel count for the Commander based on the lists, but we have ads for Commander as 30 jewels from 1965, as Bobbee points out.
So I don't think we can rule out the possibility of a 30 Jewel Commander in 1963, based on the price lists. Doesn't look like all models of the Bulova 30 morphed into Commanders, but some could have. I don't think so though.
EDIT: Here's a snippet of the Bulova 30 from the Fall 1961 price list.
And a snippet of the Bulova 30 from the Spring 1964 price list.
