Antique Ice Blue No 300 Central Glass Miniature Oil

Up for sale is an Antique Blue No 300 Central Glass Co. Miniature Oil Lamp shown in SMITH Book II, FIG. 175.  The collar is stamped with the patent dates but only partially legible.  There is a strange line or crack across the bottom of the font but it does not leak, and does not let any air pass through so I tend to think it is part of the original manufacture.  There is something similar to it on the stem as pictured.
Thanks for looking!!!

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