recently Gerhard Lang has revealed P R TORRES forgeries ... not included in boston study. article by Gerhard ... https://aps.org.au/index.php?gf-download=2020%2F09%2FAJP153-September-2020_1-3.pdf&form-id=30&field-id=18&hash=743269cf2c10a01269a847712352bb97a437de8000dc3c10f4e1767313ea3f6a&TB_iframe=true
http://www.hawaiianstamps.com/boston_lithograph.html the issue attracted several forgers , including sperati. the study is thorough, yet ID-ing items is still hit or miss ... https://colnect.com/en/stamps/list/variant/741012 https://hpshawaii.com/bulletins/ priceguide
re: HAWAII - BOSTON LITHOGRAPH ISSUES