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19xx IBM Selectric IO Model 73 Serial # 735 58 35197 19xx IBM Selectric IO Model 73 typewriter, Serial # 735 58 35197 Erik Bruchez's 19xx IBM Selectric IO Model 73 typewriter. 2025-05-21 From the Virtual Typewriter Collection of Erik Bruchez: 19xx IBM Selectric IO Model 73 Serial # 735 58 35197 Another first on TWDB! This is an IBM Selectric I/O. The label mentions "Model 73". My understanding is that:

- the first digit "7" means this is based on the Selectric I
- the second digit "3" means it is an I/O typewriter

While the label doesn't mention this, I have seen in an article references two models:

- 731: this probably means, following the standard IBM model numbers, a 8 1/2" writing line
- 735: similarly, this would be a 13" writing line

Presumably there could have been also a model 733.

This typewriter was made in the Netherlands, but has been modified to use a 120 V motor.

This machine includes a custom addition to connect it to a computer board for the SWTPC 6800 system.

I am not sure how we can date it, but the date range is between the 1960s and 1970s. It's certainly after 1961, when the Selectric I was introduced. The motor capacitor is from 1976, but it's unclear if this was replaced at the time the motor was replaced. The SWTPC 6800 system was introduced in 1975, and the custom board was made at the earliest in 1975, but it could be also a few years later, and this doesn't tell us the year the Selectric itself was made.

This needs servicing and fixing (I notice that the tab pulley is broken, for example).

NOTE: I can't use a slash in the model name for "I/O".

19xx IBM Selectric IO Model 73 #735 58 35197

Status: My Collection
Hunter: Erik Bruchez (ebruchez)
Created: 05-18-2025 at 07:29PM
Last Edit: 05-21-2025 at 07:39AM

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Description:

Another first on TWDB! This is an IBM Selectric I/O. The label mentions "Model 73". My understanding is that:

- the first digit "7" means this is based on the Selectric I
- the second digit "3" means it is an I/O typewriter

While the label doesn't mention this, I have seen in an article references two models:

- 731: this probably means, following the standard IBM model numbers, a 8 1/2" writing line
- 735: similarly, this would be a 13" writing line

Presumably there could have been also a model 733.

This typewriter was made in the Netherlands, but has been modified to use a 120 V motor.

This machine includes a custom addition to connect it to a computer board for the SWTPC 6800 system.

I am not sure how we can date it, but the date range is between the 1960s and 1970s. It's certainly after 1961, when the Selectric I was introduced. The motor capacitor is from 1976, but it's unclear if this was replaced at the time the motor was replaced. The SWTPC 6800 system was introduced in 1975, and the custom board was made at the earliest in 1975, but it could be also a few years later, and this doesn't tell us the year the Selectric itself was made.

This needs servicing and fixing (I notice that the tab pulley is broken, for example).

NOTE: I can't use a slash in the model name for "I/O".

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Hunter: Erik Bruchez (ebruchez)

Erik Bruchez's Typewriter Galleries [ My Collection ] [ My Sightings ]

Status: Typewriter Hunter
Points: 12050

I started collecting my first pre-WW2 standard typewriters in 2017. Since then I have added a few machines to my collection, which now ranges from the 1880s to the 1980s. As of 2024, I have more big standard (desktop) typewriters than portables, a few standard electrics, and some unusual machines like Varitypers, uncommon IBM machines, and more. I am not a pro restorer, but I have restored a few of my machines beyond simple cleaning.


RESEARCH NOTE: When researching the IBM Selectric IO Model 73 on a computer with lots of screen real estate, you may find that launching the IBM Serial Number page and the IBM Selectric IO Model 73 By Model/Year/Serial page in new browser windows can give you interesting perspectives on changes throughout the model series.

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