Can't use it, no manual.

Possibly similar model free online, although it states Singer and not Sergemate:

https://www.manualslib.com/manual/364570/Singer-5040.html

Manual for sale online:
https://www.sew4less.com/product/809/Sergemate_5040_and_5040L_and_432_Instruction_Manual

Might be a Singer sewing machine, but not clearly stated.

Parts manual not requested.

Operating manual for Singer 6017 for sale at the link below:

https://www.sew4less.com/product/4714/Singer_6017_Instruction_Manual

Singer 6017 Instruction Manual

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Make Model manual

Help with Singer 306K - Sewing Discussion at Stitcher's Guild ...

artisanssquare.com > ... > Sewing Machines

Nov 22, 2013 - 33 posts - ‎8 authors
Unless,the original bobbin case has been modified,or someone bought a newer ... In Ed's blog here are pictures of a 206x13 needle vs a regular 15x1 needle and ... Here is a free Singer 306K automatic sewing machine pdf manual,with ..... I was upset and so I didn't get any more details over the phone. Author Topic: Is there such a machine as
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Singer 320K2, Singer 306K Bobbin Case Conversion for ...

andrewcaddle.com/.../singer-320k2-singer-306k-bobbin-case-conversion...

Sep 13, 2014 - I recently had the good fortune to pick up a Singer 320K2 sewing machine. ... as well as Singer's zig zag model 206 utilise a needle design (206X13) which ... The 206×13 needles are becoming rare, with only two sizes and only one ....Neither can I state, beyond any doubt, that this modification won't cause ...

It's on page 56 and 57 of your user's manual, with drawings. You can download it free at the Singer Sewing machine website.

You may download a copy of the manual at http://www.singerco.com/uploads/download/264_5_8_10_12_22_dial.pdf

singer has a free downloadable manual,
http://www.singerco.com/uploads/download/748_white-480-x.pdf
if the link doesn't work go to singer
Go to the singer website
Go to the home page
Go to customer service--click on it--it will show a small menu--click on instruction manual
In the box put the model number (example w480) & click search

You may download a copy of the manual at http://www.singerco.com/uploads/download/686_2502.pdf

Check the singer website for a operation manual
Go to the singer website
Go to the home page
At the bottom of the page look for instruction manual--click on it
It will take you to another page
In the box put the model number (example 7422) & click search
They have a free download

GO TO SINGER.COM AND LOOK UP MANUALS, YOU CAN DOWNLOAD SOME AND ORDER SOME.