Orkney Image Library

Cross looks like iron cross 2nd class with oak leaves, ww2 nazi style, could be to do with sinking of royal oak, Prien was awarded the knights cross for sinking the oak.

part translation is something to do with russian convoys

it's a souvenir U-boat beer mug "celebrating" a subs success in operation drumbeat I would guess.. the representation on the side is of a Knights cross with Oak leaves so prob a specific boat commander on the front?

It shows an Iron cross with Acorn leaf decoration 1939. An anchor just visible on the handle. Presumably a commemorative drinking cup from a German escort vessel.

"Geleitzugsschlacht Paukenschlag" was the code name for the German submarine operations on the US east coast after Germany had declared war on the US (1941).
The cross should be 'the iron cross with oak leaves', until April 1942 there were only 10 Navy commander who got that.
It is unlikely that it comes from an escort ship but was a personal belonging of a crew member of one of the submarines under the command of one of those 'comanders with oak leaves'.
More info should be on the front of the drinking vessel.

"Geleitzug" means a Merchant Marine Convoy
and "Schlacht" means a campaign
"paukenschlag" means "beat the drum"

Operation Drumbeat was the U boat campaign on the east coast of America in 1942 called the second happy time. It was very successful for a time as all the lights were left on on the coast and the target ships were siloueted against the coast.Many ships who had been successfully convoyed across the Atlantic were sunk after they had left the convoy.

Lets have a look at the back

Your wish has ben granted Mr Watters.