1 BY plate research

1 BY
Format
Reverse Dateless
Authority Issuer
Croydon
Era
Unknown era
Status
In Private Ownership

Price History

£0£25k£50k£75k£100kMay 2026Jun 2026

PWIndicative estimate (recorded sales)

Indicative — not yet modelled

£90,279

Estimate

CCCollecting Cars

May 2026

£90,000

Sale
Approx value
£90,279

Plateworth estimate

Price Change

single price point

Last Sale
£90,000

May 2026

Sale Records
1

1 source

Format Median
£66,275

92 same-format sales

Vs Format Median
+36.2%

estimate vs cohort

Plate History

1 BY is a Reverse Dateless registration. Plateworth's current estimate is £90,279 with a working range of £76,737 to £103,821, based on 1 comparable sale. The latest evidence is a sale from Collecting Cars at £90,000. No active dealer listing is shown, so the page separates the Plateworth estimate from public sale evidence. This page currently shows 1 timeline event from the loaded registration record.

  1. Collecting Cars sale recorded

    Date precision: day

    May 2026

    Public sale record used by the valuation context.

    £90,000

About 1 BY

Reverse dateless plates place the numbers before the original local index letters, so the registration carries local authority provenance without a year marker. The BY index mark traces back to Croydon, now associated with London. This reverse sequence was issued from the 1950s onwards as earlier dateless runs became exhausted. At 3 characters, 1 BY sits in a very short collector tier.

Reverse datelessCroydonLondonAge-neutralUltra-short

Plate Speak

IBY

Most likely reading: "IBY"

Other possible readings

1 BYIBY1BYInitials

Price Guide for this Format

92 same-format sold records across 47 plates currently loaded.

£4,000

Lowest

£76,840

Average

£285,209

Highest

Distribution

<£3k0%
£3k-£10k18%
£10k-£50k28%
£50k-£100k24%
£100k-£250k23%
£250k-£500k7%
£500k+0%

Prices are based on loaded sale evidence and the Plateworth estimate. Latest evidence: May 2026.