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Toulouse 1969b noted that this mark is ".

The yellow green barber bottle base pictured to the left and earlier on this page is another example of a combination pontil, though it is primarily a blowpipe pontil scar with some residual iron from the pontil rod remaining on the bottle.

by 1809 as at least one embossed medicine bottle with a well established date of manufacture is known to have been molded this way Toulouse 1969b; McKearin 1970.

This seems to most commonly observed on the earlier cup-bottom mold bottles from the 1850s and 1870s which have a relatively sharp and almost non-existent heel Kendrick 1968.

This bottle was likely empontilled but is an unusual example where no trace of residual glass or iron was left behind upon pontil rod detachment, though it is possible that the action of the push-up rod erased the pontil scar or the pontil and push-up rod were the same tool and simply left no iron behind.

Short differentiating informational statements are provided below in bold to make an easy "break" between mouth-blown and machine-made bottles.

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It should be noted that many true two-piece molded bottles with pontil scars - like the "spice" bottle to the above left - have slightly indented bases which are often the result of the pontil rod pushing the flat - still plastic - base inwards to help the bottle stand upright more easily with the protruding pontil scar and not necessarily due to being molded that way.

The bottle base to the right in the above image same bottle to the left immediately above shows much more variance from round though has no apparent pontil scar.

The noted conveyor belt utility would only involve the stippling on the resting surface of the bottle base - like that on the 1941 beer bottle base below where the stippling pattern is just on the outside base edge where contact would occur.

, prior to about 1860.