Underestimated Entombment by unknown German master

Brussels Art Auctions, from Belgium, sells on 5 February 2019 a "German School, 16th / 17th century" Entombment, estimated at 5,000 to 8,000 Euro.

It is a beautiful painting in the International Gothic style, which one can find all over Western Europe, but this example indeed looks German. It seems unlikely that it would be a 17th century work, it would be very archaic by then, and is much more likely to be early 16th century, or even second half of the 15th century.

There were many masters (known by name or with a notname) in Germany at the time, and I am not very familiar  with most of them, so I have been unable so far to pinpoint an artist or region for this work. Even so, I believe it to be severely underestimated, and think it will easily fetch 25,000 to 30,000 Euro instead.

One artist who has created similar works is Caspar Isenmann (1410-1472), from Colmar (now in France, but art historically situated in Germany).

Another work which matches the one for sale in some aspects (especially the balding man and his clothing) is an altarpiece by Martin Schongauer, also from the Unterlinden Museum in Colmar.

The Virgin in the work for sale strongly reminds me of Flemish examples, e.g. by Quentin Massys (the Lamentation from Museum M in Leuven). But the remainder of the work offered here is more archaic, with its strict horizontality and lack of background, and is closer to Flemish examples like the works of Dieric Bouts (who was popular in Germany).

An Entombment by a Master from Cologne, dated to the first decade of the 16th century and now in the Art Institute of Chicago, also reminds me somewhat of the work for sale.

For comparison, a Spanish example (Pedro Sanchez de Castro) with a similar iconography, including the Gothic panels in the tomb, but a quite different execution.

I have not touched upon depictions of the entombment in other art forms, including miniatures and stained glass windows, and especially the large sculptures one can found in churches in Germany and especially France. But one of these caught my eye, a Grablegung from the Saint Michael Church in Schwäbisch Hall, from 1456. It is probably the closest composition to the one for sale here, with the man at the head, and especially with the position of the hands and feet of Jesus. Whether this is a coincidence or points to a Swabian origin of the painting (considering that the Swabian School was a rather important group of painters in these years) is not clear.