Estimated age: 1925 Patent Number 25661: This is a key piece of historical information. According to serial number lists for Boosey & Co., this patent number was used on instruments in 1925. This makes your trumpet a valuable antique, just over 100 years old. serial number: 137006 Boosey & Co. serial number charts show that instruments with numbers in the mid-130,000s were produced around 1929 to 1930. This number is more recent than the patent number, which is common as patent numbers were often used over a period of years after their initial registration. It's likely your trumpet was manufactured in the late 1920s or very early 1930s.
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