Certainly like no bomb release hook I have ever seen and it looks far too large.
Can you please measure the size of the gap (red arrow) so that we have an indication of the part size? To me it looks like some two inches/5cm.
Are there any other part numbers? Usually they are about 3/16 high and metal stamped into the alloy
Can you take photos from the direction of the yellow arrows to provide more internal detail?
Most US bomb hooks have two jaws and when closed each ring is about 1/2 inch wide. This is one of the lighter ones but the basic concepts vary little. Note there is one hook that passes fully under the ring on the bomb so it can sway from side to side without forcing the jaws. On the item you have any rocking of the "bomb" would force the jaws open.
Also the bolts in photo 4 appear to be stainless steel. Are they magnetic? Most stainless is non magnetic.
Also please look for marking on the bolt heads and measure the head size of the bolts across the flats. Standard US bolts have specific markings on the head. British bolts use different markings. I do not know what markings German bolts had but other members do. Narrowing the part down to a country of origin would be a good start.
The USAAF serial for Tondelayo may also help
Two larger US racks
Some B-17s had glider tow hooks - that is definitely not one of those either.