I use a number of GR components as standards to field-check bridge calibration at RF frequencies.  For each of the items described below I have listed the prices shown in the GR catalogs in my collection.  Catalog O (Jun-1956) and Catalog T (Feb-1968) are online at the BoatAnchor Manual Archive.

The two windings can be configured for 90 to 500 mH in series, 22.5 to 125 mH in parallel, or for a mutual inductance of 0 to 100 mH.  Calibration accuracy for series connection is ±1%.  Prices in GR catalogs: G (Dec-1932) $40.00, L (1948) $55.00, M (Oct-1951) $65.00, N (Jan-1954) $70.00, O (Jun-1956) $90.00, P (Apr-1959) $95.00, Q (May-1961) $110.00, R (May-1963) $110.00, S (Jul-1965) $110.00, T (Feb-1968) $150.00.

The accuracy of this 0.25 mH choke is specified at ±20%, but I know the exact value of mine as measured by my GR Type 1608-A Impedance Bridge.  Prices in GR catalogs: L (1948) $2.25, M (Oct-1951) $3.00, N (Jan-1954) $3.35.

This 200 pf capacitor has a specified accuracy of ±10 pf, but mine has been measured with my GR Type 1608-A Impedance Bridge.  It is usable to 1 MHz.  Prices in GR catalogs: L (1948) $5.00, M (Oct-1951) $6.00, N (Jan-1954) $5.00, O (Jun-1956) $6.00, P (Apr-1959) $6.50, Q (May-1961) $7.50, R (May-1963) $7.50, S (Jul-1965) $7.50.

These stubs are used as adjustable reactance standards with the Type 1602-B UHF Admittance Meter and the GR Type 1607-A Transfer Function and Immittance Bridge.  They have a 50 Ω characteristic impedance, and a maximum length of 20 and 50 cm., respectively.  874-D20 prices in GR catalogs: M (Oct-1951) $10.50, N (Jan-1954) $11.00, O (Jun-1956) $14.00, P (Oct-1959) $14.00, Q (May-1961) $15.00.  874-D50 prices in GR catalogs: M (Oct-1951) $12.00, N (Jan-1954) $12.00, O (Jun-1956) $14.00, P (Oct-1959) $14.00, Q (May-1961) $18.00.

These capacitor is used as an adjustable reactance standard with the Type 1602-B UHF Admittance Meter and the GR Type 1607-A Transfer Function and Immittance Bridge.  The effective capacitance range varies with frequency, and is 14 to 70 pf at low frequencies.  These stubs are used as adjustable reactance standards with the Type 1602-B UHF Admittance Meter and the GR Type 1607-A Transfer Function and Immittance Bridge.  Prices in GR catalogs: N (Jan-1954) Price on request, O (Jun-1956) $42.50, P (Oct-1959) $50.00, Q (May-1961) $60.00.

I use these to spot-check calibration of my GR Type 1606-A RF Bridge, and the 50 &Omega units as fixed resistance standards with the Type 1602-B UHF Admittance Meter and the GR Type 1607-A Transfer Function and Immittance Bridge.  Accuracy is ±1%.  The "L" indiates a locking connector.  874-W50 prices in GR catalogs: R (May-1963) $18.50.  874-W50L prices in GR Catalogs: R (May-1963) $19.50.  874-W100 prices in GR catalogs: O (Jun-1956) $17.50, P (Apr-1959) $32.50, Q (May-1961) $35.00, R (May-1963) $35.00, S (Jul-1965) $35.00, T (Feb-1968) $40.00, U (Feb-1970) $48.00, 73 (Nov-1972) $55.00.

These are used in a variety of roles with my GR RF bridges.  The numeral at the end of a type number indicates the distance of the short- or open-circuit from the face of the bead in the connector.  874-WN prices in GR catalogs: M (Oct-1951) $3.50, N (Jan-1954) $2.25, O (Jun-1956) $2.50, P (Apr-1959) $2.50, Q (May-1961) $3.50, R (May-1963) $3.50, S (Jul-1965) $4.50, T (Feb-1968) $6.50, U (Feb-1970) $8.00, 73 (Nov-1972) $9.75.  874-WN3 prices in GR catalogs: N (Jan-1954) $2.75, O (Jun-1956) $3.75, P (Apr-1959) $4.25, Q (May-1961) $4.75, R (May-1963) $5.50, S (Jul-1965) $6.50, T (Feb-1968) $6.50, U (Feb-1970) $8.00, 73 (Nov-1972) $9.75.  874-WO prices in GR Catalogs: M (Oct-1951) $2.00, N (Jan-1954) $1.75, O (Jun-1956) $1.75, P (Apr-1959) $1.75, Q (May-1961) $2.00, R (May-1963) $2.50, S (Jul-1965) $2.75, T (Feb-1968) $5.00, U (Feb-1970) $7.00, 73 (Nov-1972) $8.75.  874-WO3 prices in GR catalogs: N (Jan-1954) $2.50, O (Jun-1956) $2.50, P (Apr-1959) $3.00, Q (May-1961) $3.75, R (May-1963) $4.00, S (Jul-1965) $5.00, T (Feb-1968) $5.00, U (Feb-1970) $7.00, 73 (Nov-1972) $8.75.