The Dive Watch Connection

I recently purchased a sharkhunter sub 300t and it is limited to 150 pcs. I cannot find any info of why this particular model is limited to 150pcs. There are some models with 300 or 500 limited pcs. Any info would be much appreciated. Thanks

I am new to the forum and just purchased a pre owned sharkhunter sub 300 t-graph w/ black dial and the classic bezel limited to 150 pcs. I cannot find any info of why this is a limited edition. There are some limited of 300 and 500pcs. Any help would be much appreciated. Thanks