"Production Modification" is the term Harbour Lights prefers to what we call "variations" or "errors". Basically, these are changes made 'on-the-fly' during production.

Back in the early days, ordering quantities were smaller and so "modifications" could be made after just 200 or so were made (Like Split Rock MI/MN) As more and more collectors had 'discovered' Harbour Lights, initial orders increased. At the time the Beavertail tower was changed from tan to gray, there were 3,000 made initially.

Now Hudson-Athens shows us 4,000 were initially ordered.

These larger quantity orders also means that production is more consistent through a run since there are fewer 'breaks' when colors can be changed etc.

John