What is the age of my Wurlitzer upright piano, serial # 237674?

Between 1925 and 1930. A more precise dating would require possibly examination of markings on the piano or a piano technician or a historian who specializes in vintage pianos. Piano Serial Numbers Search - Find the Age & History of Your Piano (total-piano-care.com)

Gulbransen Player Piano - Antique Piano Shop

1927 Gulbransen 55" Upright Piano (intunepianoservices.com)

Gulbransen Upright Pianos - Piano restoration & sales nationwide: Steinway, Yamaha & Knabe (countrypiano.com)

1920: Serial numbers around 140,000
1925: Serial numbers around 218,000
1930: Serial numbers around 301,000

This was an easy search!

-Details of Ronisch Pianos-
Make Ronisch Made by Pfeiffer / Bluthner Rating (see Key) Estimated Number In UK Year and serial number 1855 -420 1875 -6100 1895 - 23000 1915 - 63200 1935 - 76250 1955 -78300 1966 - 100000 1985 - 185000 2000 - 209960 1 more row

Ronisch Pianos Information ' Roberts Pianos - Oxford

https://www.robertspianos.com > cdetails > Make=Ronisch...
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Ronisch piano serial number reference information. Find out ...

http://www.besbrodepianos.co.uk > pianoserialnumber
Find out the age of your Ronisch piano here. Simply type in the serial number into the box below then click "Calculate". Type in your piano's serial number:.

It was made between 1955 and 1960.

https://www.total-piano-care.com/wurlitzer-pianos.html

http://besbrodepianos.co.uk/pianoserialnumber/wurlitzer.htm

I am assuming this is an upright Circa Wurlitzer made in 1930 . A similar model was sold here for £300. https://santamaria-ca.americanlisted.com/music-instruments/upright-gulbransen-piano-circa-1930s-300_26296029.html
Some are going for more like £500. Others are being given away for next to nothing! (£35 or less!)
It depends entirely on the condition of your piano, not just what model it is.

I suggest you pay for what is called a "blue book" valuation of your piano. You can do it all online and it costs around £25. http://www.concertpitchpiano.com/Appraisal.html

contact wurlitzer if you can't find the answer on the internet.

(1905)!! Please Read On How To Tell How Old Your Piano Is !! I Learned This From Grandma !!
Piano serial numbers usually have five to seven digits, but may have fewer or more, depending on the manufacturer and age of your piano. Serial numbers may also include a letter as well.
Here are the TOP FIVE places to locate the serial number of your spinet, console, or upright piano:
Serial number locations are found:
1) On the piano's cast iron plate. After lifting up the lid, look along the top front area of the plate. The serial number may be to the right or the left, or in the middle.

2) Under the opened lid on the ledge, stamped on a little plaque, to the right or to the left.

3) Stamped on the back of the piano; near the top of the wood frame.

4) Printed on one of the hammers, found on either end of the piano (newer or imported pianos).

5) Printed on one the keys - behind the nameboard, inside the piano (newer or imported pianos)

Kimball piano values vary based on age and condition; as of 2015, many uprights sell for $10,000 or more. Kimball is a well-known brand, and several of its antique pianos are considered highly collectible.
The Kimball Piano Company, based in Chicago, was one of the largest piano manufacturers in the world. At the turn of the century, Kimball built approximately 20,000 pianos annually. Kimball produced pianos under different brand names such as Hinze, Dunbar, Whitney and Harrison. Styles were influenced by Victorian, Greek Revival and Arts and Crafts architecture, and upright models were often available as player pianos. Kimball was sold to the Jasper American Corporation in 1959, and its pianos were discontinued in 1996.

Your piano was manufactured between 1976 and 1980. Source: http://www.total-piano-care.com/wurlitzer-pianos.html

Free Piano Age Research Look here. It looks like it was built between 1939 and 1940. Go down the page til you find Wurlitzer; after 1937: The year built is found by finding the serial number 192157, which would be between 180000 and 195000. That would make it having been built between 1939 and 1940. Hopefully, that's correct.

It was made in 1970.