Thorens Chromatic with external spring

Thorens a Swiss manufacturer of high-end audio equipment used to manufacture harmonicas between 1914-1921 and 1938-1952.

One of the three chromatic harmonicas they manufactured caught my attention. Similar to the Koch chromatic, one of their 10 hole chromatics came with an external compression spring.

10-hole Thorens chromatic harmonica with external compression spring

My assumption is that the 10-hole chromatic with compression spring was the first of the three chromatics Thorens brought to market. I would date it back to the late 1930s.

Thorens chromatics, from my collection

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