There's a few really good reads on the case gin.
This link tells of the history and mostly has seal/embossed pictures. Though the general design shape of the bottle might help determine the approx. age.
I love the look of the lip, just gnarly old written all over it. A top shelf display case gin Mark-congrats on the recovery, as if you weren't there it would be just a shard of lost history. Congrats.
Nice recovery! My intuition is that this is a Dutch bottle from circa 1860-70s. I don't think there's any significance to the mold marks on the base. It's an unusually crude lip finish that reminds me of this Dutch schnapps bottle:
I’ve been wondering with all the links I’ve been reading and no ref to the bottom of those bottles.
Harry Prists, you win, it’s obvious you have forgotten more than most remember. demijohn page
Warning!!! There is a test on the last page everyone else, read and look at pics carefully