Hello muddyboots !
Normally, I would think it impossible to draw a straight line from an EKM/dogtag to the field-unit
the soldier served in, without any additional informations. If, as in your case, you know at what
place and time the dogtag is taken, I would agree that this soldier was at that time in 11. Pz.Div.
However, I would like to point out the fact, that he might have been in one (or more) other units as well.
Why I think so :
The dogtag says 4.[Kp]/Pz.Ers.(atz)-Abt.[eilung].
In October 1942, all replacement units were split into a training (Ausbildungs) and a replacement (Ersatz) compartment.
The Ersatz compartment usually had a St.(amm)-, a Gen.(esenden) and a M.(arsch)-Kp.
At least from that time on, the draftees would usually be inducted at the St.Kp. and
get a dogtag starting with - a number- St.Kp.PzE.A. 35.
So from that fact alone, I would think, that this EKM was issued prior to Oct. 1942.
In addition, this dogtag has the number 100, which I would consider a rather low one.
As I think this is a running number, it points to a draft time early in the war.
Therefore I think, it is possible that he was drafted already in 1940 (maybe even earlier).
I found an example here in WMA forum of a soldier drafted in March 1943 to Stamm-Kp. Pz.E.A. 35,
and already has a number -5132- for example (btw, that soldier was sent to Pz.Rgt. 36).
So, maybe "your" soldier saw much more action, than you thought of !
Perhaps some of the dogtag experts can help to shed some more light on this.