Official Numbers 44417-44434

As usual, I am attempting to extract as much information as possible from a source and, in this case, am returning to a list of the Official Numbers , including Port of Registry, allocated to vessels.
This list, in numerical order, starts with a vessel in 1882 and ends with one in 1862, telling us that the numbers were not allocated chronologically. The two highlighted groups are of vessels built in the Isle of Man but why we have a trio, then a gap of one ship, followed by a group of six Manx vessels is a mystery. I am still trying to discover whether batches of numbers were issued to individual locations, or builders, who then used them as they constructed each ship or on some other basis. It's a mystery!

However, the fact that CREST 44427 sits as the single Ramsey-constructed ship amongst a batch built in the South of the Isle of Man might add weight to the idea that she was built by Gibson Macdonald of North Ramsey who are the only Shipbuilders listed in Ramsey at that time. They remain my front-runner in the construction-stakes!

44417 LORD CLYDE 1882 Scarborough 115
44419 PRINCE ALFRED Swansea
44420 AVALANCHE Cork 29
44421 VESPER Douglas 22
44422 ROVER Douglas 40
44423 ATALANTA Douglas 23
44424 FRED Peterhead 16
44425 HARKAWAY Douglas 49
44426 IOLANTHE Douglas 45
44427 CREST Ramsey 47
44428 JUBILEE Douglas 23
44429 BESSY Douglas 24
44430 BESSY Castletown 36
44431 PRINCE ALBERT Aberdeen 258
44434 BON ACCORD 1862 Aberdeen 99

Note: The figure at the end of each entry refers to the Register Tonnage of the vessel.