Suspicious? 10 French Francs coins

I have bought two ten francs coins recently, because of suspicious seller behavior, I decided to measure them.
I haven't done this before and was suprised that measurements was similar but nevertheless not exact.
10 Francs 1929: weights 9,95 grams (accuracy of weights I used, is 0,05 grams), diam: 27,93; 27,91; 27,89; 27,87 mm; thickness: measured from edge 1,99 - 2,03 and over the middle 1,98 mm.( measured with digital caliper, justified with guages).
10 Francs 1930: weights 9,90 grams (accuracy of weights I used, is 0,05 grams), diam: 28,06 - 27,99 mm; thickness: measured from edge 1,88 - 1,90 and over the middle 1,95 mm. (measured with digital caliper, justified with guages).
Are these irregularitys normal?

They seem like pretty minor differences here, you're talking about a couple of hundredths of a millimetre which could be due to wear.

No more opinions? Is this possible that these coins are some carefully made replicas? So called novodels?
Or if they are originals, are all of their kind similarly a bit oval and not in exact weight?

As an engineer, I think you're asking too much of machining tolerances.