They measure approx 1.1/2" in length
Just found my answer
http://oldsingersewingmachineblog.com/tag/bobbins-for-vintage-singer-sewing-machines/
http://www.ismacs.net/singer_sewing_machine_company/singers_missing_link_the_high_arm_vibrating_shuttle.html
Yes, you're right. I just donated my vintage treadle singer sewing machine (with all attachments including bobbins like yours) to Oxfam, as they renovate and service them, then send them out to remote parts of Africa where they have no electricity. It seems such a brilliant idea and use for these sturdy old workhorse machines. Mine was still in working order despite being made in the late 1800s. Amazing workmanship and quality that you rarely find today.
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