
I searched the net looking for pics of the bunker lids, the pic above is of the Lydia Eva approx 1920
steam drifter, which shows a very slight circular pattern, i have a better pic of it but it is an Alamy
pic which is copy wright so I don't know if I can post it here,

These next pics are of some various models and they also show the ring pattern,

and this one,

This one is of the Imara Tug boat that I built and they also show the circular pattern,

This is a nice resin bunker lid, they were quite cheap but the shipping from America was too dear,

These cast metal ones I found at Float a Boat and i bought four each of the ones with the X next to them, hope fully they will be ok,
thanks for looking in,
best regards john.
.