My mom had a 401A she used to create just about all her clothes.   She did not have the organic pod looking container like something out of the Jetsons.   

Of all these kits on ebay you can buy - this is one of them.   And I am an ebay trader you ever saw.  :P  

So leaning into that period's ad copy:

There was a time when a well-made garment spoke for itself.

A neat buttonhole. Clean edges. Even stitching.
Not the sort of thing one fusses over—
but the sort of thing people notice.

Today, of course, there are shortcuts.
Hand-cut holes. Uneven stitching. “Good enough.” (never mind Computer Driven machines - What is this world coming to????)  

But then—so much is “good enough.”

With the Singer Buttonholer, your machine does what it was meant to do:

• Forms perfect, uniform buttonholes
• Repeats them exactly, every time
• Uses precision templates for proper sizing
• Attaches in moments—no special skill required

No guesswork. No wasted fabric. No apologies.

Complete kit includes:

• Original Singer buttonholer attachment
• Interchangeable templates (various sizes)
• Mounting hardware
• Original molded case
• Instruction sheet

Designed for Singer Slant O Matic Slant needle machines including:

301, 401, 403, 404, 431, 500 (Rocketeer), 503

(Not suitable for low-shank machines.)

There’s a difference between something that merely holds together
and something that is properly made.

This is the tool that makes that difference.

You don’t always get a second look.

But when you do, it’s the small things that stand out. 
------------------------------------------------------------------------- :P -------------------------------------------
or even better - if you have a minute...Ma'am and trust me - you do..... 

Ma’am, let me ask you something—

When you finish a garment…
do you feel proud of it…
or do you hope nobody looks too closely?

Because I’ve seen both.

I’ve seen careful work—and I’ve seen buttonholes that tell a story all their own.

Crooked. Frayed. Different sizes.
The kind of thing you think nobody notices…

…but they do.

Now here—just look at this.

(salesman sets the attachment down, calm, confident)

This is the Singer Buttonholer.

You don’t “try” to make a buttonhole anymore.
You don’t guess. You don’t trim and hope.

You attach it…
select your template…
and your machine produces perfect buttonholes—every single time.

• Same size
• Same stitch
• Same clean finish

Front to back. Garment after garment.

And here’s the part most people don’t realize:

It doesn’t matter how good your machine is
if the finishing work lets you down.

A fine Singer—301, 401, even the Rocketeer—
deserves to be used properly.

Otherwise, you’re doing half the job.

This kit includes everything:

• Original Singer buttonholer unit
• Full set of templates (5)
• Mounting hardware
• Original case
• Instructions

Nothing missing. Nothing to chase down later.

You take it out, you put it on, and you’re in business.

Now I won’t tell you what your time is worth.

But I will tell you this—

How many times do you want to redo a buttonhole?
How many garments get set aside because “it didn’t come out right”?

And how many times do you look at something you made and think…

“That could have been better.”

This solves that.

Not tomorrow. Not after practice.

Immediately.

You’ve already got the machine.

This is the part that makes it complete.

(slight pause, softer tone)

Go ahead—take a look at the templates.

You can feel the quality.

Item must be returned within 30 Days and Refund of purchase price shipping not included only will be given as: Money Back via pay pal or through the method paid. Buyer to pay return shipping as well. 3% restocking charge if item not broken. I don't end auctions early. Buy-it-now items are in my ebay store. If you have a concern about your purchase please contact me, as I work hard for your satisfaction starting with prompt shipping.

International Buyers Please Note:

Import duties, taxes, and charges are not included in the item price or shipping cost. These charges are the buyer's responsibility. Please check with your country's customs office to determine what these additional costs will be prior to bidding or buying.